I'm a sucker for the old Bible Epics, but that's kind of an acquired taste. So like superhero films, etc only a few can be whole heartedly be called great. But I can give some pros about clunkers like The Silver Chalice ( because I'm a sucker for old 50's epics. Ben Hur and The Ten Commandments are the obvious bests. Jesus of Nazareth is the best on Christ, King of Kings is my favorite.
The Cohen Bros just put a satire out that was kind of about those films (and it had an Orthodox Patriarch in it), the film and the attempt at satire was hit and miss....but the Cohen's are very hit and miss for me anyway. The scene with The Patriarch was funny though.
I'm suprised you know Barabbas, I thought it was obscure. I like it, I don't think I'd randomly recommend it to anyone though.
Off the top of my head the unquestionably great are:
The Passion of Joan of Arc (silent), Intolerance (silent), Aur Revoir les Enfants, The Decalogue (Kieslowski), The Bells of St Mary's / Going My Way, Beckett
Great or good in a way, but over rated and/or or not exactly Christian (mileage may vary on how you categorize them):
Life of Brian, Black Narcissus, Andre Rublev and Tree of Life are pretty darn good but a bit pretentious and overly ponderous and plodding, Passion of the Christ I don't like but it is an artistic achievement, A Man For All Seasons (I love it, but it's a bit too earnest), The Gospel of St Matthew (same as Passion of the Christ), Moonstruck, My Big Fat Greek Wedding, It's a wonderful life, The Sound of Music, Bicycle Thieves, On The Waterfront, The Scarlet and The Black, Rudy
I haven't seen Calvary, that may be a good modern film.